Learn how to use your Nikon D90 camera from the world's most respected instructor: Ken Rockwell, who is world-renowned for his online, plain English guides to using popular cameras and photographic gear.

Ken takes you through a practical, hands-on explanations of the camera's many features, functions and settings. As you're reading through the guide, you can touch unfamiliar terms to call up glossary entries for more detailed information, and the interactive, iPhone interface makes it easy to visually identify the camera's controls and to learn what they do and how best to use them. Ken also identifies useful lenses and other accessories and tells you where to look online for the best deals.

Read through the entire guide to get to know your camera, then use this app as a handy pocket reference when you have a question about an unfamiliar feature or need some help trying to get a tricky shot. Whether you're an experienced photographer or just starting out, Ken Rockwell's Guide to the Nikon D90 will help you get the most out of your camera.